Fail-safe actuator with two permanent magnets

Details Fail-safe actuator with two permanent magnets Fail-safe actuator with two permanent magnets

1998-06-18

2000-03-21

Donovan, Lincoln

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

With magneto-mechanical motive device

335229, 335230, H01F 700, H01F 708

Patent

active

060407522

ABSTRACT:
An electromagnetic actuator has two permanent magnets arranged along their polar axes, with the proximal poles having same polarity. An electromagnet surrounds the two permanent magnets and, when energized, overrides the repulsion between the proximal poles and moves one permanent magnet toward the other fixed magnet. Should the electromagnet fail, the actuator reverts to the unactuated position without need of a spring, gravity and so forth.

REFERENCES:
patent: 3243238 (1966-03-01), Lyman
patent: 4129187 (1978-12-01), Wengryn et al.
patent: 5434549 (1995-07-01), Hirabayashi et al.
patent: 5809157 (1998-09-01), Grumazescu
patent: 5818131 (1998-10-01), Zhang
patent: 5820104 (1998-10-01), Koyano et al.

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